Hardware control via a cin

I have the c++ code to control and collect data from an external piece of hardware (Nest of Birds) and I am trying to get LabView to both control and acquire data from it. The C code has an initialization, data acquire and shutdown stage. I am able to complete the whole sequence using a CIN provided there is no loop on the data acquisition stage. However if I try to split the code into separate CINs I can not get the data acquisition stage to loop.
Please could you help me?
Ol

onlyol wrote:
What you are saying makes a lot of sense!
The reason I was trying to use the CIN is because I have all the C++ code for the hardware control. My programming knowledge is fairly limited and as the C++ code is quite complex (for me!). I thought using a CIN would require the least manipulation of the program - but clearly this isn’t going to work.
So do you recommend that I try to rewrite the C++ code in LabView and only call the DLL?
It would really depend. If that C++ code is doing anything complex and involved it definitely wouldn't be feasable to try to do this all in LabVIEW. The you have another option: Turn that C++ code into your own DLL and call that DLL from LabVIEW. CIN development is only fun anymore if you want to do some pretty esotoric stuff or are doing it just for the fun of tinkering with a technology which at some point was quite useful. (LabVIEW for Windows 3.1 really needed that for interfacing in a good way to all kind of external code without always having to convert between 16bit and 32bit memory and causing performance hits by this.) Another approach might be to write one CIN which implements all three functions and takes an extra selector input to tell it which of the three functions it should execute. Then you won't have troubles with global variables residing in three different code resources and not being able to reference each other across CIN bounderies. But honestly the DLL aproach is most probably the best to follow.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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matthewabennett wrote:
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